Thank you for your good suggestion.
Indeed, I have figured out a widget which makes use of the LiveText function point.
In the widget, I have to use internal LiveText APIs(an private extension point) to achieve the effect.
Without the API, you can't access LiveText from your Java code.
I don't know whether the API will be published or not in the future. I hope that they will publish it soon.
If you have any question, please contact dragon directly.